The Krabby Patty Burglar is an alter-ego of SpongeBob SquarePants. He is a parody of "The Hamburglar" from McDonald's.
SpongeBob as the Krabby Patty Burglar wears his Krusty Krab hat on his head and wears a darkish-red mask around his face.
He only appears in the episode, "Krabby Land." He is Krabby The Clown's sidekick. When Mr. Krabs leaves, SpongeBob SquarePants quickly claims himself to be Krabby The Clown's beloved sidekick and attempts to stall the kids. He works until the kids rip his arms off and use them as boomerangs.